That's the load out for the Ruger Alaskan I have. Great load and like a freight train at full tilt boogie to stop

I thought I heard 250 grain. This reminds me of the girl shooting through peeps. The balloons and the peeps act like ballistic gel and if you think of the penetration results in that then 4 balloons was my guess as well. Now I wonder how different it would have been if the balloons were touching. The initial shock hitting the ballon may burst the second or third before the bullet penetrates thus creating less resistance as the bullet travels. So touching I would say 5-6 balloons.